In the U.S. can car dealerships pull your entire credit report, or just your score if you go into them to apply for a loan? Of all the research I've done, it sounds like its just your FICO score that they're allowed to pull, not the entire report, but I haven't found any concrete evidence to support either one.
When they pull your credit report you generally sign a paper giving them the right to do it. So they can pull whatever you give them permission to do.
If the credit is provided through an outside lender (basically always) then only they would have access to the full report, and through discussions with the finance rep at the dealership, they can provide details about the report (approved or not approved and why).